Honeywell C645A-E User's Manual
Contents
1. 5 thousand cfh input Optional Specifications 1 C645A with position indicator and manual reset 2 C645A operation to 1 5 in WC with position indicator and manual reset 3 C645B with position indicator and manual reset 4 C645C with position indicator and manual reset 5 C645D with 2 in 50 8 mm differential Accessories 1 C645A B D Mounting Bracket part no 15865AC 2 C645C Mounting Bracket part no 112657A 3 C645A Cover with Window part no 137637B 4 C645B Cover with Window part no 137637C 3 1 2 88 9 MOUNTING BRACKET 4 8 l I I 1 WO i 3 16 2 I 1 1 P _ 1 8 27 NPT 15 9 2 1 2 63 5 Ss 1 5 16 gt 33 3 M7564 Fig 1 Dimensions of C645A B D and E in in mm 60 2159 8 C645A E PRESSURE SWITCHES MOUNTING BRACKET OPTIONAL MANUAL gt lt 5 16 RESET llamXauoH 1 8 27 INCH NPT le 2 1 4 2 3 4 7 7 8 DIA 200 57 1 69 8 M7563 AN important FOR MODELS WITH LOCKOUT DO NOT OBSTRUCT MANUAL RESET LEVER Fig 2 Dimensions of C645C in in mm INSTALLATION When Installing this Product Mounting Read these instructions carefully Failure to follow them The C645 has a hexagonal fitting with a 1 4 in NPT tapping could damage the product or cause a hazardous which is the high pressure connection in differential condition applications The bleed fitting is 1 8 in NPT female tapped In Check the rati2. ae aaa aaiae aeaa aaa teed aiaa 1 SPCCHICATOMS EEATT 2 Ordering Information ccceecceeseeeeeeeeeeeeeeeeeseeeeeeeseeeenaees 2 Installations tuiahnaAnk adh onea e a nein 4 Settings and Adjustment ecceeceseeeeeeeeeeteeeteeseneeennens 6 Operation and Checkout ecceeeceeeeeeeeeeeeeeeeseeeeneeeseeeeaees 7 60 2159 8 C645A E PRESSURE SWITCHES SPECIFICATIONS Models C645B Pressure Switches break a circuit when pressure C645A C D Pressure Switches break a circuit when rises to scale setting Refer to Table 1 pressure falls to scale setting minus the differential C 645E breaks circuit when pressure falls to scale setting Refer to Table 1 minus the differential Refer to Table 1 Table 1 Pressure switch model selection Differential Differential Maximum Maximum Natural Switch Range Range Surge Surge or LP Switching Position in we kPa Pressure Pressure Cover Action Indicator psi kPa Window Auto Recycle Optional 34 5 Optional or Lockout eerie eee 34 5 34 5 34 5 10 3 4 5 fo yN fo o N o 3to21 0 7 to 5 2 5to35 11 2 to 8 7 3to21 0 7 to 5 2 5to35 11 2 to Yes 8 7 Yi Lockout es Y es o c Y Y 0 i Yes Auto Recycle Optional or Lockout Auto Recycle C645D 3to21 0 7 to Yes Auto Recycle No 5 2 5 2 a Locks out when pressure falls to setpoint minus differential can be reset manually after pressure rises to setpoint Locks o
3. Honeywell C645A B with Window GENERAL The C645 pressure switches are safety devices used in positive pressure or differential pressure systems to sense gas or air pressure changes Copyright 1995 Honeywell Inc All Rights Reserved C645A E Pressure Switches PRODUCT DATA FEATURES e C645A B models are for use on natural gas LP gas or air e C645B1047 includes a scaleplate stop to meet American Gas Association AGA requirements for gas fired boilers with inputs over 2 1 2 million Btuh e C645C D models are for use on air only e C645E for use with distillate fuel oil e Spring loaded diaphragm actuates snap acting Micro Switch e Switch can be wired to turn on alarm e C645A C and D models break control circuit on pressure fall e C645B models break control circuit on pressure rise e Lockout and manual reset optional in A and C models e Removable zinc plated cover protects scaleplate and adjusting screw e Lockout models have external manual reset lever e Pipe tappings allow selection of positive pressure differential pressure or venting connections e Optional switch position indicator available e Models of C645A B available with cover window for setpoint visibility e Buna N fiber reinforced material for increased control diaphragm strength e Two seal off diaphragms for added reliability Contents General srep he die tere tie sete chen e i doa 1 Features geienian din a dil a
4. apolis Minnesota 55422 4386 In Canada Honeywell Limited Honeywell Limit e 35 Dynamic Drive Scarborough Ontario M1V 4Z9 International sales and service offices in all principal cities of the world Manufacturing in Australia Canada Finland France Germany Japan Mexico Netherlands Spain Taiwan United Kingdom U S A 60 2159 8 2 Switching Spdt Micro Switch snap acting switch Fig 3 Minimum Ambient Temperature 20 F 29 C Maximum Ambient Temperature 125 F 52 C Connections 1 4 18 NPT female tapping for main or high pressure connection 1 8 27 NPT female tapping for venting or low pressure connection Approvals Underwriters Laboratories Inc listed C645AE File no MP2168 Guide no MFHX for use in ambient temperatures normally prevailing in occupiable spaces which usually are not higher than 77 F 25 C but can occasionally be as high as 104 F 40 C for brief periods 2 7 8 73 gt 3 1 2 88 9 3 8 9 5 lt 1 1 8 28 6 IMPORTANT FOR MODELS WITH LOCKOUT DO NOT OBSTRUCT MANUAL RESET LEVER C645A E PRESSURE SWITCHES Canadian Standards Association listed C645A E File no LR1620 369 Guide no 140 A 2 for use subject to same ambient temperature restrictions as Underwriters Laboratories Inc Factory Mutual Approved Industrial Risk Insurers C645A D models with window in cover approvable for applications on burners over 5 million Btuh
5. ckwise 7 Replace cover oo 60 2159 8 6 23466 ADJUSTING LOCKING WRENCH SCREW SCALEPLATE STOP M7562 SET POINT INDICATOR Fig 6 Adjusting C645B1047 scaleplate stop Manual Resetting The C645A C manual reset models lock out at scale setting minus the differential and require manual resetting after the pressure rises to scale setting to resume normal operation The C645B locks out at scale setting and requires manual resetting after the pressure falls to scale setting minus the differential to resume normal operation To reset push the reset button as far as it will go then release IMPORTANT Lockout models cannot be made to recycle automatically by permanently holding in the reset lever OPERATION AND CHECKOUT Operation The C645A C D E spring loaded diaphragm actuates the Micro Switch snap acting switch to break a control circuit when pressure falls to scale setting minus differential The switch can be wired to turn on an alarm at the same time When the pressure rises to the scale setting the control circuit requires manual resetting to reset and turn off alarm Optional C645A model will recycle automatically when the control circuit returns to scale setting C645A E PRESSURE SWITCHES The C645B spring loaded diaphragm actuates the Micro Switch snap acting switch which breaks a control circuit locks out and turns on an alarm if so wired when the pressure rises to the scale setting W
6. g to prevent electrical shock and equipment damage All wiring must agree with applicable codes ordinances and regulations An opening is provided to accommodate rigid conduit or armored cable for line voltage operation Fig 3 and 4 Do not overload the switch contacts see Switch Ratings in Specifications section The switching schematic is shown in Fig 5 SET POINT a ADJUSTMENT SCALE BLEED SCREW PLATE FITTING OPENING XN SCREW MICRO SWITCH MANUAL RESET LEVER M7560 ON LOCKOUT MODELS ONLY Fig 3 C645A B D with cover removed C645A E PRESSURE SWITCHES OPENING FOR 1 2 INCH CONDUIT MANUAL RESET LEVER ON LOCKOUT MODELS ONLY ADJUSTMENT SCREW M7561 PLATE FITTING Fig 4 C645C with cover removed C645A C D BREAKS R W MAKE R B ON PRESSURE FALL MANUAL RESET MODELS LOCK OUT A C645B BREAKS R B MAKES R W ON PRESSURE RISE AND LOCKS OUT M7565 Fig 5 Schematic showing switch in zero pressure condition 60 2159 8 C645A E PRESSURE SWITCHES SETTINGS AND ADJUSTMENTS Pressure Setpoint Adjustment Table 4 C645C Control Points Tables 2 through 4 give the pressure and switching for each Pressure Pressure setpoint To adjust the pressure setting turn the setpoint in of Water kPa adjustment screw Fig 3 and 4 clockwise 7N to increase m RWmaess 1 025 the pressure setting and counterclockwise wN to decrease RW makes 1 0 53 b 2 Table 2 C645A D E control points 3 Pressure Pres
7. hen pressure falls to the scale setting minus the differential the switch lockout can be manually reset turning off the alarm Checkout C645A B Gas or Air Switch Set cutoff pressure Open main supply line Depress reset lever on lockout models until switch makes R W Set controller and limit switch to call for heat For C645A close main shutoff valve Valve should close when pressure reaches cutoff point For C645B wait a few minutes for the pressure to rise then lower the scale setting until the switch makes R W and locks out NOTE To more accurately check C645A use slow bleedoff For C645B jumper other limit and let pressure rise to cutoff setting Q For C645A reconnect the control valve open the shutoff valve press the reset lever if necessary and return the pressure switch to its original setting For C645B raise setting to normal Depress reset lever Q Allow system to operate through at least one complete cycle to make certain all components are functioning properly C645C D Air Switch Only Set cutoff pressure Turnon fan If using a manual rest C645 depress and hold lever until switch makes R W Block fan inlet or filter area Switch should break R W make R B when pressure drops to cutoff point Manual reset models lock out Remove obstruction Depress reset lever and allow system to operate through at least one complete cycle to make certain all components are functioning p
8. ngs given in the instructions and on the differential pressure control applications using air connect the product to make sure the product is suitable for your lower pressure to the bleed fitting Fig 3 and 4 In application applications using combustible gases vent the bleed tapping Installer must be a trained experienced service according to applicable standard code or jurisdictional technician authority After installation is complete check out product operation as provided in these instructions The C645A B D can be mounted in any position but are more accurate when mounted horizontally The C645C is mounted AN CAUTION with the diaphragm vertical and the bleed fitting at the bottom Disconnect power supply before beginning installation to prevent electrical shock or equipment damage 60 2159 8 4 The C645E1002 Distillate Fuel Oil Pressure Switch is the same as the C645A1006 Gas Pressure Switch except that it does not have a 0 015 in 0 38 mm diameter nominal orifice in its 1 4 in NPT main high pressure connection This orifice is required in a C645A Gas Pressure Switch to restrict gas leakage but it is too small for oil applications The C645E1002 has a 0 125 in 3 18 mm diameter nominal opening in its 1 4 in NPT main connection into its pressure chamber CAUTION Vent the bleed tapping back to the oil supply tank not to the combustion chamber Wiring Disconnect power supply before connecting wirin
9. roperly C645E1002 Distillate Fuel Oil Switch The C645E1002 is the same as the C645A1006 Gas Pressure Switch except the C645E1002 has a 0 125 in NPT main connection in its pressure chamber See Checkout for C645A 68 8 60 2159 8 Honeywell Home and Building Control Honeywell Inc 1985 Douglas Drive North Golden Valley Minnesota 55422 60 2159 8 F P Rev 5 95 Home and Building Control Honeywell Limited Honeywell Limit e 35 Dynamic Drive Scarborough Ontario MIV 4Z9 Printed in U S A on recycled paper containing at least 10 post consumer paper fibers www honeywell com bbc
10. sure in of Water kPa ae E M o Rwimekes o 22 i Nominal differential 0 2 in of water 0 05 kPa 52 a Lee ae ce 210 52 ine between 0 2 and 0 8 in of water 0 05 and 4 5 Maximum differential 0 8 in of water 0 2 kPa 77 C645B1047 Scaleplate Stop Adjustment a Nominal differential 1 in of water 0 2 kPa The C645B1047 is the same as the C645B1013 except for a gt Differential between 1 and 3 in of water 0 2 and 0 7 kPa scaleplate stop e Maximum differential 3 in of water 0 7 kPa d Maximum differential 4 in of water 1 0 kPa Specifications Scaleplate Stop Limits maximum setting factory set at 5 1 4 in of water Table 3 C645B control points 1 31 kPa Pressure Pressure Scale Range in of Water kPa 3 to 21 in of water 0 75 to 5 23 kPa 3 Adjusting Wrench 0 5 Part no 23466 included with the C645B1047 To Adjust Scaleplate Stop 3 7 Remove cover 21 5 2 Loosen scaleplate stop locking screw about 1 2 turn 45 counterclockwise with the 23466 Adjusting TP MASES i Wrench a Nominal differential 1 in of water 0 2 kPa gt Differential between 1 and 3 in of water 0 2 and 0 7 kPa Maximum differential 3 in of water 0 7 kPa Maximum differential 4 in of water 1 0 kPa Maximum differential 5 7 in of water 1 4 kPa Move scaleplate stop until bottom edge is aligned with desired maximum setting Tighten scaleplate stop locking screw clo
11. ut when pressure rises to setpoint can be manually reset after pressure falls to setpoint minus differential Without indicator on Auto Recycle with indicator on Lockout model d With surge orifice 0 6 to 0 1 to 5 3 1 3 2 to 20 2 0 7 3 4 3 4 3 3 2 0 7 0 2 5 0 2 5 0 2 5 0 2 5 05 0 02 1 5 0 5 0 5 0 2 5 3 Tom 2 zi Switch Ratings Amperes Alternate Electrical Ratings when used with Honeywell Bahia ea a o ooo FI feguard P II C645 models Model 120Vac 240 Vac Blame oefeauerd mregrammers all eete models _ eto yj eulload Ignition 540 VA Transformer a oe ii C645D Main Valve 250 VA with 10 times inrush C645C Full Load 8o 5a O 400 VA with 2 1 2 times inrush All models also rated 2A at 30 Vac ORDERING INFORMATION When purchasing replacement and modernization products from your TRADELINE wholesaler or your distributor refer to the TRADELINE catalog or price sheets for complete ordering number or specify 1 Order number 3 Optional specifications 2 Air or gas control on C645A B models 4 Accessories if desired If you have additional questions need further information or would like to comment on our products or services please write or phone 1 Your local Honeywell Home and Building Control Sales Office check white pages of your phone directory 2 Honeywell Home and Building Control Customer Relations Honeywell 1885 Douglas Drive North Minne
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